Door-alarm



(No Model.)

J SIMON Door Alarm. No. 231,502. Patehted Aug. 24, 1880..

NIPErERS, PHDTO-LITROGRAPHER. WASHINGTON a C I UN TE STATES PATENTGrrrcn.

JOHN SIMON, OF'OAKLAND, CALIFORNIA.

DOOR-ALARM.

SPECIFIGATIONT forming part of Letters Patent No. 231,502, dated August24, 1880. Application filed June 26, 1880. (No model.)

To all whom it may concern:

Be it known that '1, JOHN SIMON, of the city of Oakland, in the countyof Alameda and State of California, have invented an ImprovedDoor-Alarm; and I do hereby declare that the following is a full, clear,and exact description thereof, reference being had to the acoompa nyingdrawings.

My invention relates to that class of dooralarms in which a gong isattached to the lockspindle inside of the house, instead of the ordinaryinside door-knob, so that the turning of the lockspindie to withdraw thebolt and open the door strikes the gong and sounds an alarm.

The object of my invention is, first, to simplify the striking mechanismof the gong; and, secondly, to provide an improved arrangement fordisconnecting the cam and striker when it is desired to prevent theturning of the spindle from striking no alarm.

Referring to the accompanying drawings, Figure 1 is a view of myinvention applied to a inortise lock, a part of the shell of the alarmbeing broken away. Fig. 2 shows a front View, in detail, of the alarmmechanism in workingposition. Fig. 31s a similar view, showing the partsof the apparatus thrown out of action. Fig. aisalongitudinal section ofthe parts in detail. Fig. 5 shows details ofthe pawl and dog.

Let A represent a section of a door, in or to which a door-lock issecured. B is the spindle or shank which passes through the doorlock,and serves, when turned,to throw back the latch and allow the door toopen.

G is the ordinary door-knob, which is secured to the end of the shank onthe outside of the door, while the gong-knob is secured on its oppositeend, inside the house, so as to serve as the inside knob.

The shank or spindle B extends entirely through the gong-knob on theinside of the door, and has a thread cut on its end, on which the gong Dis screwed.

Between the gong and door I place upon the shank or spindle a sleeve, E,which has a circular flange, f, fitting against the door, and upon thissleeve I place a concave disk, Gr, facing outward, so that the concavedisk forms the inner half of the knob, while the gong forms the outerhalf.

0n the end of the sleeve E, inside the concave disk G, I secure a plate,h. This plate therefore turns with the sleeve audits flange, independentof the knob-spindle. To this plate I secure the striker j and its armis, which are connected together at right angles in the usual way.

A screw, i, passes through the end of the arm is at the angle, while theopposite end of the arm is bent inward, so as to form a toe,().

A wire spring, S, has one end attached to the toe, while its middle iswound around the projecting screw and its opposite end is fastened tothe plate h, so that the spring keeps the striker in place.

A cam or trip lever, Z, is secured to the lookspindle close to theplate, and it has one or more teeth or points, n, formed on its end, sothat when the spindle is turned the teeth strike the toe O on the end ofthe arm 7c consecutively, and throws the hammer back and causes the gongto strike. This is an extremely simple and effective arrangement of thestriker.

The flange f has a circular slot, 1", out in it near its edge onopposite sides, and a screw or pin, t, passes through each slot atopposite corners, so that the flange can be turned in either directionas far as the screws or pins will allow, and as the sleeve E and plate hare connected with the flange, they will also be turned with it. Whenthe flange is turned as far as it will go in one direction the plate Itis in position to allow the cam or trip lever l to operate the striker,but when it is turned as far as it will move in the opposite directionthe plate is turned so as to carry the striker out of reach of thetrip-lever, when the spindle can be turned without striking the gong.

A small handle, 21, is secured to the flange, by means of 'which theflange can be turned, and a latch, w, is arranged to engage with anotch, w, in the edge of the flange, in order to secure it in positionand hold it against the strain ot the trip-lever when the device is setfor striking. This forms an exceedingly simple arrangement by which thegong can be used or not, as desired.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a knob-gong, the combination, with the spindle, of the plate h,cam or trip le- Verl, located upon the spindle, hammerj, having the armI; and spring S, and the sleeve E, having the flange f and connected tothe plate h, the fiangef, having curved slots 1", with screws 1 workingin opposite corners of said slots, and a slot, .1, with which engages aholding device, 10, substantially as and for the purpose set forth.

2. In a door-knob gong, the sleeve E and plate 12, connected with aflange,f, said flange having the curved slots 1", with their pins t, and15 having the latch 20 arranged to engage with a notch, x, in its edge,substantially as above specified.

In witness whereof I have hereunto set my hand and seal.

JOHN SIMON. [L. s.] Witnesses:

WM. F. CLARK, EDWARD E. OSBORN.

